go install: no install location for directory outside GOPATH

When you run go install Go looks for $GOBIN env variable path. Either you need to set your $GOBIN to $GOPATH/bin

$ export GOBIN=$GOPATH/bin

and/or add $GOBIN to your OS search path

$ export PATH=$PATH:$GOBIN

To use the command without getting the error.

The problem was as James Henstridge commented, for some reason there was an issue with my user directory name case. Even though the directory is lowercase, I had to make it capitalized.

This worked:

GOPATH=/Users/Daryl/go

This didn't:

GOPATH=$HOME/go

However, since moving to a rMBP from my iMac, I had no problems whatsoever setting up Go, so, to this day, I'm not sure what was going on, but in that instance the capitalization fixed it.